Results 1 to 10 of about 15,396 (229)

The 40K‐K dating system: 1. Improving data interpretation using new model calculations

Meteoritics &Planetary Science, EarlyView.
Abstract The 40K‐K cosmic‐ray exposure (CRE) dating system offers a promising method for determining exposure ages of iron meteorites by combining the radioactive cosmogenic 40K with the stable cosmogenic isotopes 39K and 41K. However, earlier applications relied on semi‐empirical production models and inconsistent analytical data sets, limiting their ...
Farshid Nozarian, Suzette Timmerman, Ingo Leya   +2 more
wiley   +1 more source

SUZAKU OBSERVATIONS OF MODERATELY OBSCURED (COMPTON-THIN) ACTIVE GALACTIC NUCLEI SELECTED BY SWIFT/BAT HARD X-RAY SURVEY [PDF]

, 2016
We report the results obtained by a systematic, broadband (0.5–150 keV) X-ray spectral analysis of moderately obscured (Compton-thin, 22 ≤ log N H < 24 ) active galactic nuclei (AGNs) observed with Suzaku and Swift/Burst Alert Telescope (BAT). Our sample
T. Kawamuro, Y. Ueda, F. Tazaki, C. Ricci, Y. Terashima   +4 more
semanticscholar   +1 more source

Description and terrestrial ages of the Calama Area Meteorite Collection (Atacama Desert, Chile)

Meteoritics &Planetary Science, EarlyView.
Abstract We present a comprehensive study of a meteorite collection from the Atacama Desert (Chile), the driest and most climatically stable desert in the world. This collection includes meteorites from three adjacent Dense Collection Areas (DCAs) in the northern part of the Atacama Desert: Calama, Sierra Gorda, and Chug Chug, referred to as the ...
Carine Sadaka, Jérôme Gattacceca, Florian Dumas, Régis Braucher, ASTER Team, Matthieu Gounelle, Dilyara Kuzina, Cyril Lorenz, Alexandre Corgne, Pierre Sempéré   +9 more
wiley   +1 more source

X-Ray Weak Active Galactic Nuclei from Super-Eddington Accretion onto Infant Black Holes

Astrophysical Journal Letters
A simple model for the X-ray weakness of James Webb Space Telescope–selected broad-line active galactic nuclei (AGNs) is proposed under the assumption that the majority of these sources are fed at super-Eddington accretion rates. In these conditions, the
P. Madau, F. Haardt
semanticscholar   +1 more source

Bolometric luminosities and Eddington ratios of X-ray selected active galactic nuclei in the XMM-COSMOS survey [PDF]

, 2012
Bolometric luminosities and Eddington ratios of both X-ray selected broad-line (Type-1) and narrow-line (Type-2) active galactic nuclei (AGN) from the XMM–Newton survey in the Cosmic Evolution Survey field are presented. The sample is composed of 929 AGN
E. Lusso, A. Comastri, B. Simmons, M. Mignoli, G. Zamorani, C. Vignali, M. Brusa, F. Shankar, D. Lutz, J. Trump, R. Maiolino, R. Maiolino, R. Gilli, M. Bolzonella, S. Puccetti, M. Salvato, C. Impey, F. Civano, M. Elvis, V. Mainieri, J. Silverman, A. Koekemoer, A. Bongiorno, A. Merloni, S. Berta, E. Floc’h, B. Magnelli, F. Pozzi, L. Riguccini   +28 more
semanticscholar   +1 more source

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, EarlyView.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

Ensemble X-ray variability of active galactic nuclei. II. Excess variance and updated structure function [PDF]

, 2016
Context. Most investigations of the X-ray variability of active galactic nuclei (AGN) have been concentrated on the detailed analyses of individual, nearby sources.
F. Vagnetti, R. Middei, M. Antonucci, M. Paolillo, R. Serafinelli   +4 more
semanticscholar   +1 more source

A Low‐Power Radioisotope XRF Spectrometer for Detection of Light Elements on Planetary Missions

X-Ray Spectrometry, Volume 55, Issue 5, Page 721-729, September/October 2026.
ABSTRACT Current X‐ray spectrometers for in situ geochemical analysis on planetary missions typically rely either on X‐ray tubes, which demand electrical power and add mass and thermal complexity, or on alpha particle X‐ray spectrometers (APXS) that use rare 244 Cm sources, and come with severe concerns on radiation safety and isotope availability.
Leandro Silveri, Artem Knyazev, Hashem Alaidaros, Maryam Manzoor Amanullah, Zach Ioannou, Tengiz Ibrayev, Danish Khan, Sara Leardini, Laura Manenti, Simi Maria Emilia Mangani, Safa Naseem, Sandhya Sharma, Sara Trevisan, Alia Zino, Francesco Arneodo   +14 more
wiley   +1 more source

LONG-TERM X-RAY VARIABILITY OF TYPICAL ACTIVE GALACTIC NUCLEI IN THE DISTANT UNIVERSE [PDF]

, 2016
We perform long-term (≈15 years, observed-frame) X-ray variability analyses of the 68 brightest radio-quiet active galactic nuclei (AGNs) in the 6 Ms Chandra Deep Field-South survey; the majority are in the redshift range of 0.6–3.1, providing access to ...
G. Yang, W. Brandt, B. Luo, B. Luo, Yongquan Xue, F. Bauer, Mouyuan Sun, Mouyuan Sun, Mouyuan Sun, S. Kim, S. Schulze, S. Schulze, X. Zheng, M. Paolillo, O. Shemmer, Teng Liu, D. P. Schneider, C. Vignali, F. Vito, Junxian Wang   +19 more
semanticscholar   +1 more source

The Gamma Factory: A New Experimental Paradigm for the Post‐HL‐LHC Era

Annalen der Physik, Volume 538, Issue 8, August 2026.
ABSTRACT The Gamma Factory (GF) proposal is motivated by the recognition of a largely untapped potential of the CERN accelerator complex to enable a new research program at the intersection of particle, nuclear, atomic, fundamental, and applied physics. These fields could benefit from novel experimental tools made possible by a future GF facility.
Mieczyslaw Witold Krasny
wiley   +1 more source